Multiple fuse and method of manufacture



Aug. 4, 1959 A. VISCHER, JR 2,898,424

MULTIPLE FUSE AND METHOD OF MANUFACTURE Filed Sept. 15, 1956 2Sheets-Sheet 2 ALFRED VISCHE'R JR.

(W @ZMWJ M J w- I ATTORNEYS.

United States Patent MULTIPLE FUSE AND METHOD OF MANUFACTURE AlfredVischer, Jr., Park Ridge, 111. Application September 13, 1956, SerialNo. 609,752 24 Claims. (Cl. 200-425) The present invention relates tofuses, and more particularly to multiple fuses of the type comprising aplurality of fusible links which are adapted to be selectively connectedinto operative engagement in an external circuit.

Although the many advantages of multiple fuses have been recognized fora great number of years and such numerous multiple fuses have beendesigned and developed in that time, the prior art multiple fuses leavemuch to be desired, particularly in the way of manufacturing cost andease of operation. In order to provide a good electrical connectionbetween the fuse links and an associated selector contact member, it isusually necessary to resort to high contact pressures between the fuselinks and the contact member or members. As a result, a substantialforce must be applied to the fuse in order to move the contact memberrelative to the fuse links in order to change the particular fuse linkwhich is operatively connected in the Work circuit. Consequently, theoperation of the prior art type fuses is particularly difficult and thisdifliculty is accentuated when a fuse link must be changed in a darkenedarea because of the problem of indexing the selector member and the newfuse link.

Therefore, a principal object of the present invention is to provide anew and improved multiple fuse.

Another object of the present invention is to provide a multiple fusewhich may be manufactured at a sufliciently low cost to enable thecompetitive marketing thereof.

A further object of the present invention is to provide a new andimproved fuse which while safe and reliable in use may be operated witha minimum of force.

A still further object of the present invention is to provide a new andimproved fuse which may be manufactured at a minimum cost.

A yet further object of the present invention is to provide a multiplefuse plug which may be easily operated so as accurately to connect a newfuse link into the work circuit after another link has been blown.

Another object of the invention is to provide a new and improved methodfor manufacturing at least parts of multiple fuse plugs.

Briefly, the above and further objects are realized in accordance withthe present invention by providing a screw-in type multiple fuse plug inwhich a plurality of fuse links ofa common fuse element are respectivelymounted on a rotatable carrier member which is supported within the fusebody and which may be manually rotated in step-by-step fashion through aa mechanical advantage mechanism for selectively positioning respectiveones of the fuse links in operative engagement with a connector member.

The invention, both as to its organization and method of operation,together with further objects and advantages thereof, will best beunderstood by reference to the following detailed description taken inconnection with the accompanying drawing, in which:

Fig. l is a sectioned elevational' view of a multiple fuse plugembodying the present invention;

Fig. 2 is a sectional view of the fuse plug of Fig. 1

:taken along the line 22 thereof, assuming the entire structure to beshown therein;

2,898,424 Patented Aug. 4, 1959.

Fig. 2a is a sectional view of the fuse taken along the line 2a2athereof;

Fig. 3 is an elevational view of the fuse plug of Fig. l partly brokenaway and viewed from along the hue 33 thereof, assuming the entirestructure to be shown in Fig. 1;

Fig. 4 is an end view of the fuse plug of Fig. 1 taken along the line 44thereof, assuming the entire structure to be shown in Fig. 1;

Fig. 5 is an isometric view of a fuse element carrier;

Figs. 6-8 are plan and elevational views of a fuse element in thevarious steps of manufacture prior to the mounting thereof on the fuseelement carrier shown in Fig. 5; and

Fig. 9 is a plan view of a combined gasket and name plate.

Referring now to the drawings and particularly to Figs. 14 thereof,there is shown a multiple fuse plug 10 which comprises a generallytubular plug body or housing member 12 in the central cavity of which isdisposed a fuse element carrier member 14. The carrier 14 is arranged tobe rotated in step-by-step fashion through a mechanical advantagemechanism which includes an eccentric hub 15 on a cover member 16. Asbest shown in Figs. 2 and 5, the hub 15 loosely extends through acentral aperture 19 in the carrier 14 and a plurality of spaced apartteeth 17 protrude radially from the periphery of the carrier 14. Thecarrier 14 thus constitutes a spur gear which is adapted to be rotatedin an internal spur gear 18 formed integrally with the inner wall of thebody 12 by means of a plurality of arcuate teeth 20 which are spacedapart by a plurality of recesses 21. The pitch of the gears are the samebut the external gear on the carrier 14 has less teeth than the internalgear 18, one less tooth in the illustrated embodiment of the invention,so that the carrier 14 rotates through a predetermined fraction ofthree-hundred sixty degrees for each complete revolution of the hub 15.In the illustrated embodiment of the invention the external gear has tenteeth, the internal gear 18 has eleven teeth, and therefore, when thecover 16 is rotated clockwise, through one complete revolution forexample, the carrier 14 rotates counterclockwise, through thirty-sixdegrees.

In accordance with an important aspect of the invention, an electriccontact member 22 is mounted on the body 12 and extends along one sideof the cavity therein in place of one of the teeth 20 on the internalgear and is resiliently biased toward the carrier to perform two'necessary functions, one, to connect a selected fuse link to oneterminal of the fuse plug 10, and two, to coact with the teeth 17 toprovide a detent for accurately positioning and maintaining the carrier14 in the selected position. Considered in greater detail and as bestshown in Fig. l, the contact and detent portion of the member 22 isconstituted by an inclined resilient finger 24 which extends Within thecavity of the body 12 through an aperture 25 firmly to engage a selectedone of a plurality of radially disposed fuse links 26 which are mountedon the carrier 14 with the individual fuse links 26 being positionedbetween the teeth 17 and emanating from the central portion of thecarrier 14. The fuse links 26 are integral parts of a fuse element 27which has a tubular portion 29 positioned in the aperture 19 between thecarrier 14 and the hub 15. The fusible portion 26b of each fuse link 26is of reduced width and the contact portion 26a is substantially largerto provide a large contact surface against which the finger 24 ispressed. Since the teeth 17 are cycloidal in shape, when the hub 15 isrotated to a position such that the carrier 14 is positioned adjacentthe finger 24, even if the selected fuse link 26 plug of Fig. 1

is not accurately aligned with the finger 24, the force exerted by thefinger 24 on one of the other of the adjacent teeth 17 rotates thecarrier 14 to the proper position.

Considering the fuse plug 10 in greater detail, the plug body 12, whichis preferably molded of porcelain or the like, has an external portion28 to which is threadedly attached a conductive shell 30. The shell 30provides one terminal of the fuse plug 10. As best shown in Figs. 3 and4, the contact member 22 includes a fiat arcuate flange 32 whichpartially surrounds a tubular boss 33 on the plug body 12 and seats onthe face of a shoulder 34 on the plug body 12. The ends 32a of theflange 32 are cut on a radius to coact with an arcuate shoulder 36 whichextends outwardly from the shoulder 34 diametrically opposite a groove37 in which the contact finger 24 is positioned. Consequently, when theshell 30 is threaded onto the body 12, an annular flange 40 of the shell30 firmly presses against the ring 32 to insure good contact. A goodcontact between the contact member 22 and the shell 30 is maintained bystaking the flange 4% through slots 43 in the flange 32 and intorecesses 42 in the shoulder 34 which locks the assembly together.

As best shown in Fig. 1, the groove 37 is aligned with the aperture 25and the upper extremity of the finger 24 extends beyond the carrier 14and rides on the periphery of an annular shoulder 46 provided on acircular cap portion 48 of the cover 16. The shoulder 46 is seated in anannular rabbet formed by the flat upper surfaces of the teeth 28 and thecylindrical inner wall of the plug body 12. The radius of the shoulder46 is substantially greater than the radius of the periphery of thecarrier 14 so that when the upper end of the finger 24 is riding on theshoulder 46 its contact portion is held out of engagement with the teeth17 and the fuse links 26. A notch 49 is provided in the plug body 12 inalignment with the aperture 25 and the groove 37 to provide a space intowhich the finger 24 is moved while it is riding on the shoulder 46. Whenthe cover 16 is oriented so that a recess or notch 50 in the shoulder 46is positioned in alignment with the finger 24 the natural resiliency ofthe finger 24 causes it to move toward the carrier 14 and intoengagement with one of the fuse links 26. Since, as best shown in Fig.2, the width of the finger 24 is only slightly less than the spacebetween adjacent teeth 17, and since the teeth 17 have a curved orcycloidal operative surface, when the cover 16 is rotated to a positionwhere the notch 50 is in alignment with the finger 24, the finger snapstoward the carrier 14 and even if a fuse link 26 is not accuratelyaligned with the finger 24, the finger acting as a detent snaps intoengagement with the fuse link 26, rotating the carrier 14 the necessaryamount.

The notch 50 has a tapered side 50a which provides a cam surface forelevating the finger 24 onto the shoulder 46 when the cover 16 isrotated in a clockwise direction to change the fuse element. Moreover,the extremity of the finger 24 has a rounded edge portion 24a whichcooperates with the tapered side or cam surface 50a to facilitatestarting the rotation of the cover 16. Obviously, turning of the coverin a counterclockwise direction is prevented by the engagement of theflat edge 24b of the finger 24 with the flat side of the notch 50. Ifdesired, however, both sides of the notch 50 and finger 24 may betapered to permit rotation of the cover 16 in either direction. However,in order to insure that a fresh fuse link 26 will be moved intooperative position each time that the cover 16 is rotated, it ispreferable to permit rotation of the cover 16 in only one direction.

The second terminal of the fuse plug is a conductive plug 53 which ispositioned in a hole 54 in the center of the boss 33, and a contactmember 55 connects the mounted plug 53 to the fuse element 27. As shown,the plug 53 has a head 69 which engages the outer face of the boss 33and has an inner end 62 of reduced cross section around which ispositioned, and preferably staked, a flat ring portion 64 of the contactmember 55. The contact member 55 also includes a resilient finger 66positioned in a groove 70 in the hub 15 and the end portion 66a of thefinger 66 is offset resiliently to engage the common annular portion 29of the fuse element 27.

The hub 15, which has a cylindrical outer surface, is mounted foreccentric rotation within the plug body 12, by means of a suitablemachine screw 74 which extends through a central bore 75 in the plug 53and is threaded into a bore 72 in the hub 15. The bore 72 is displacedfrom the central axis of the hub 15 to provide the neces saryeccentricity, so that, as described above, rotation of the hub 15 causesreverse rotation of the carrier 14. As shown, the plug 53 may becounterbored as indicated at 76 to receive the head of the machine screw74 and provide a flush outer contact surface. Also, the bore 72 in thehub 15 is counterbored as indicated at 78 to facilitate positioning ofthe machine screw 74 in the bore 72 during assembly since it ispreferable that the bore 72 be tapped by the thread of the screw 74 atthe time the fuse plug 10 is initially assembled. To this end, the cover16 may be molded of a suitable plastic such as, for example, Lucite. Itis desirable to tap the thread in the bore 72 at the time of assembly sothat the axial position of the cover 16 in the plug body 12 isadjustable and remains in the adjusted position. An important functionof the screw 74 is to provide an adjustment for the proper venting ofgases which are released when a fuse blows. These gases can, therefore,escape between the body 12 and the underside of a suitable annulargasket 82, which is positioned between the cover 16 and the body 12.

In order to facilitate rotation of the cover 16 so as to move adifferent fuse link 26 into engagement with the finger 24, the externalsides 80 of the cap 48 are knurled. Furthermore, a smooth action betweenthe cover 16 and the plug body 12 is provided by means of the gasket 82which is positioned between the upper face of the body 12 and the innerface of the cap 48. If the cap 48 is formed of a transparent materialsuch as Lucite, the gasket 82 may, as shown in Fig. 9, have a printedouter surface for identifying the size of the fuse, the manufacturer andany other suitable information or advertising.

As shown, the upper end of the cover member 16 has a concave outersurface 84 to reduce the amount of material between the user of the fuseand the fuse links thereby to facilitate the observance of the links 26.

Referring now to Figs. 5-8, for a detailed consideration of themanufacture of the fuse element 27 and its assembly to the carrier 14.In Figs. 6a and 6b, there is shown a fuse element blank which may besuitably stamped from a sheet of fuse material. As best shown in Fig.6a, the fuse links 26 are alternately spaced on opposite sides of acentral rectangular body portion 85 which has its opposite ends 85a and85b cut on an angle so that a number of the fuse elements 27 may becontinuously stamped from a single strip of sheet metal. If desired, theenlarged head portions 26a of the fuse links 26 may correspond in sizeto the spaces defined by adjacent fuse links 26 so that a number of theelements 27 may be punched from a single sheet with adjacent elements 27having interfitting links 26. In this manner, a minimum of the fusematerial is wasted. Ordinarily, however, the fuse elements 27 are cutfrom a continuous strip since the cost of the material which is thuswasted is negligible, and the stamping machinery is less complex.

After the fuse element 27 has been stamped from either a strip or asheet, it is folded over along its center line to the configurationshown in Figs. 7a and 7b. As shown, the fuse links 26 lying on oppositesides of the element 27 are alternately spaced, the contact portions 26apartially overlapping. The folded over unit 27 of Figs. 7a and 7b isthen formed into a cylinder as shown in Figs. 8a and 8b and insertedinto the central aperture 19 in the carrier 14 with the fuse links 26extending toward the top of the carrier (toward the left as viewed inFig. 5). The individual fuse links 26 are then folded back over a ringportion 88 of the carrier 14 between the teeth 17 thereof and theextremities 90 of the links 26 are bent over the undercut shoulders 92on the ring 88 to hold them in place after the fuse has blown andseparated this part from the main body. The common contact portion 29 ofthe fuse element 27 is thus positioned for continuous contact with theresilient finger 66 of the contact member 55. A transparent disk 92a,suitably formed of mica, is provided for holding the ends of the links26 in place on the carrier after the portions 26b have blown. The disk92a has a plurality of radial slots 93 extending from a central aperturefor tightly receiving a plurality of upwardly extending radialprotrusions 94 provided on the carrier 14, thereby to attach the disk92a to the carrier 14.

In operation, the fuse plug 10 is threaded in a suitable receptacle orsocket in the usual manner, contact with the external work circuit beingestablished by the head 60 of the sleeve 53 and by the shell 30. Thecarrier 14 is in conducting relationship with the contact member 22 andcurrent is thus transmitted from the shell 30 to the finger 24 andthrough a fuse link 26 to the common contact member 55 and to the plug53. Since the finger 24 is resilient and biased toward the carrier 14,it presses firmly against the contact portion 26a of the selected fuselink 26. Similarly, the finger 66 resiliently engages the portion 29 ofthe fuse ele ment 27.

After the operatively positioned fuse link 26 has blown and it isdesired to connect a new fuse link 26 in the circuit, the operatorrotates the cover 16 clockwise as viewed in Fig. 2 through one completerevolution. During the initial portion of this rotating movement of thecover 16, the cam surface 24a at the extremity of the finger 24 rides onthe cam surface 50a at the side of the notch 50 to lift the finger 24radially outward into the notch 49 and onto the periphery of theshoulder 46. During the remaining portion of the revolution of the cover16 the extremity of the finger 24 rides on the shoulder 46 and thefinger 24 is thereby kept in the notch 49 and out of engagement with thecarrier 14. Consequently, contact between the finger 24 and the fuselinks 26 is prevented and, in addition, the finger 24 does not interferewith the easy rotation of the carrier 14.

Since the carrier 14 has one less tooth than the internal gear 18, whenthe eccentrically mounted hub 15 is rotated through one completerevolution, the fuse carrier 14 is rotated through an angle equal to thespacing between the teeth thereof. Since in a preferred embodiment ofthe invention ten teeth 17 are provided on the carrier and eleven teeth20 are provided on the internal gear 18, the carrier 14 rotates through36 degrees for each complete 360-degree rotation of the cover 16.Consequently, when the cover 16 is rotated through one complete turn, anew fuse link 26 is brought into operative position and engaged by the'finger 24 as it snaps into place. During the rotation of the fusecarrier 14, the mica disk 92a will likewise be rotated because asdiscussed above it is secured to the carrier 14.

It will thus be seen that there is provided in accordance with thepresent invention a multiple fuse element which, while'being reliable inuse from an operational standpoint, may be operated by the applicationof a minimum external'force in order to change the fuse links. Animportant feature of the fuse 10 is that each of the fuse links 26 has aseparate enclosure or nest which restricts the blown fuse particles from,splattering jg g the mec an sm .11 10 other fuse compartments,

6 While the invention has been described in connection with particularembodiments of the invention, it will be understood that variousmodifications may be made thereon which are within the true spirit andscope of the invention as defined in the appended claims.

What is claimed as new and is desired to be secured by Letters Patent ofthe United States is:

1. In a multiple fuse plug, the combination of a body member having aninternal gear therein, a fuse element carrier in the form of an externalgear, said external gear having less teeth than said internal gear,means for mounting said external gearwithin saidbody in operativeengagement with said internal gear, and means ineluding an eccentricstructure for actuating the internal gear to drive it relative to saidexternal gear.

2. In a multiple fuse plug, the combination of a housing member formedof an insulating material, carrier means for supporting a plurality ofspaced apart fuse links, said carrier means being disposed within acavity in said housing, cover means for covering said cavity to enclosesaid carrier means, and means responsive to rotation of said cover meanswith respect to said housing means for causing said carrier means torotate with respect to said housing means through an angle less thanthat through which said cover means is rotated.

3. In a multiple fuse plug, the combination ofa housing including aninternal gear, a fuse link carrier including an external gearoperatively disposed within said internal gear, said external gearhaving one less tooth than said internal gear, a plurality of fuse linkseach respectively mounted on said carrier between the teeth thereof,contact means mounted on said housing at a position corresponding to atooth of said external gear and resiliently biased toward said carrier,and rotatable eccentric means including structure disposed within saidhousing for manually actuating said carrier to drive said external gearin said internal gear, whereby for each complete revolution of saideccentric means a new fuse link is operatively connected to said contactmeans.

4. The combination set forth in claim 3 in which said gears-are spurgears.

5. The combination set forth in claim 4 in which said contact meansincludes a contact member having a width which is slightly less than thespacing between the teeth of said gears and the teeth of said externalgear are bevelled toward the extremities thereof, whereby said contactmeans provides a detent for properly locating said internal gear.

6. In a multiple fuse plug, a body member having an open cavity therein,a cover for enclosing said cavity,

said cover being rotatably supported by said housing, a fuse elementcarrier disposed within said cavity, said carrier including an externalgear which mates with an internal gear in said body member, and a hub onsaid cover which loosely engages a portion of said carrier, said hub andsaid portion of said carrier providing an eccentric connection fordriving said external gear in said internal gear.

7. The combination set forth in claim 6 in which the number of teeth onsaid internal gear differs from the number of teeth on said externalgear. 7

8. In a multiple fuse plug, the combination of a housing, a fuse elementcarrier rotatably mounted in said housing, a plurality of fuse linkshaving portions spaced apart about the periphery of saidcarrier,resilient contact means mounted at a fixed position in saidhousing and biased toward said carrier to make contact with a selectedone of said fuse links, and rotatable means for rotating said carrierwith respect to said contact means to change the fuse link which is inoperative engagement with said contact means, said rotatable meansincluding a cam surface for forcing said contact means out of engagementwith said fuse links and said carrier.

9. The combination set forth in claim 8 wherein said carrier includesperipheral protruding portions which separate said fuse links and whichcoact with said contact means to provide a detent.

10. In a multiple fuse plug, the combination of a tubular body formed ofan insulating material and having an internal spur gear therein, a fuseelement carrier in the form of an external spur gear, said external gearhaving less teeth than said internal gear, a plurality of fuse linksspatially arranged on said carrier, said links being connected togetherat the central portion of said carrier and having fusible portionsextending radially outwardly between said teeth, a contact membermounted in said housing at the position of a tooth in said internal gearand being resiliently biased toward the edge of said carrier, a coverrotatably mounted on said body over the cavity to at least partiallyenclose said carrier, said cover having a hub portion eccentricallyconnected to said carrier for driving said carrier in said internal gearwhen said cover is rotated, and means on said cover for coacting withsaid contact means for moving and maintaining said contact means awayfrom said carrier while the cover is being rotated to change theselected fuse link.

11. The combination set forth in claim 10 wherein said last claimedmeans is a cylindrical shoulder having a notch therein.

12. In a multiple fuse plug, the combination of a cavitied housing, afuse element carrier rotatably mounted in said housing, a plurality offuse links spatially arranged on said carrier, contact means mounted insaid housing and resiliently biased toward said carrier, a cover forenclosing the cavity in said housing, and a circular shoulder on saidcover, the periphery of said shoulder engaging a portion of said contactmeans to move it out of engagement with said carrier, and a notch insaid shoulder to receive said contact means and enable connectionthereof to a selected one of said links.

13. The combination set forth in claim 12 in which said notched portionincludes a tapered surface on only one side thereof for camming saidcontact means onto said shoulder as said cover is rotated in aparticular direction relative to said housing.

14. In a multiple fuse plug, the combination of a housing including aninternal gear, a fuse link carrier including an external gearoperatively disposed within said internal gear, said external gearhaving less teeth than said internal gear, a plurality of fuse linksspatially arranged on said carrier, contact means mounted at a fixedposition on said housing and biased toward said carrier to engage one ofsaid links, and manually rotatable eccentric means disposed within saidhousing for driving said external gear in said internal gear.

15. In a multiple fuse plug, a body member having an open cavitytherein, a cover for enclosing said cavity, said cover being rotatablymounted on said housing, a fuse element carrier disposed within saidcavity, said carrier including an external gear which mates with aninternal gear in said body member, and means on said cover for drivingsaid external gear in said internal gear.

16. The combination set forth in claim 15 in which the number of teethon said internal gear differs from the number of teeth on said externalgear by one.

17. A plugin type multiple fuse comprising a housing member formed of aninsulating material and having a threaded outer portion formed of aconductive material, said housing having a central cavity surrounded byan internal gear integral with said housing, a fuse element supportmember mounted within said cavity, said support member having radiallyprotruding portions to provide an external gear, said gears having thesame pitch, said external gear having one less tooth than said internalgear, a rotatable hub mounted within said cavity, said hub being mountedfor eccentric rotation in said housing and being received within anaperture in said support member so that rotation of said hub causes saidsupport member to travel around said internal gear, a plurality of fuselinks each respectively disposed between said protruding portions onsaid support member, detent means fixedly positioned in said cavity forengaging and holding said support member when it occupies apredetermined relative position with respect to said internal gear,conductive means engaging one side of each of said fuse elements, and acontact member fixedly positioned in said cavity for engaging the otherside of a selected one of said fuse elements when said detent means isin engagement with said support member.

18. The fuse set forth in claim 17 wherein said detent means includessaid contact member.

19. A plug-in type fuse comprising a generally cylindrical insulatinghousing having a threaded outer portion and internal gear integraltherewith, a fuse element support disposed Within said housing andhaving externally extending portions forming a gear having one lesstooth than the spaces between the teeth of said internal gear, saidsupport being mounted within said housing for eccentric rotation in saidinternal gear, a plurality of fuse elements each being respectivelypositioned on said support between said extending portions, meansconnected to said support and extending outwardly from said housing tofacilitate manual rotation of said support, and a plurality of mutuallyinsulated contact means mounted on said housing, one of said contactmeans engaging one side of all of said fuse elements and another of saidcontact means being mounted in said housing between said internal gearand said support for engaging a selected one of said fuse elements at alocation spaced from the location at which said first contact engagesthe selected fuse element.

20. A fuse element comprising a hollow cylindrical central portionformed of a folded-over and circularized metal sheet and a plurality ofspatially arranged fuse links extending from the marginal edges of thefoldedover sheet, the adjacent ones of said links extending fromopposite sides of said folded over sheet.

21. In a multiple fuse, the combination of a plurality of spaced apartfuse links, contact means for contacting a selected one of said links,said fuse links and said contact means being relatively rotatable, androtatable selector means rotatable through an angle different from thespacing between said fuse links for causing rotation of said contactmeans relative to said fuse links to change the one of said fuse linksselected, and said selector means and said fuse links being rotatableabout a common axis.

22. A fuse element comprising a tubular portion formed of a folded-overand circularized metal sheet, and a plurality of spatially arranged fuselinks extending from the marginal edges of the folded-over sheet, theadjacent ones of said links extending from opposite sides of saidfolded-over sheet.

23. The combination set forth in claim 2 wherein said angle of rotationof said carrier means is equal to the spacing between adjacent fuselinks when said cover is rotated through an angle of three hundred andsixty degrees.

24. A multiple fuse element comprising a folded-over metal sheet havinga plurality of spatially arranged fuse links extending from the marginaledges of the folded over sheet, the adjacent ones of said linksextending from opposite sides of said folded-over sheet.

References Cited in the file of this patent UNITED STATES PATENTS1,485,636 Skinner Mar. 4, 1924 1,555,638 Davis Sept. 29, 1925 1,848,792Moss Mar. 8, 1932 1,848,924 Ammerman Mar. 8, 1932 1,914,871 SiarnposJune 20, 1933 2,106,109 Prendergast Jan. 18, 1938 2,498,124 Holmes Feb.21, 1950 2,579,624 Stanley Dec. 25, 1951

